what is the error in the XML response? - php

Question

I have the following php code (getRout.php).. which response results in xml formats ... But I got this error :
XML Parsing Error: no element found
Location: http://127.0.0.1/direction2/getRout.php
Line Number 1, Column 1:
edit
You can see the xml response directly by requesting this url :
http://www.yournavigation.org/api/1.0/gosmore.php?format=kml&flat=52.215676&flon=5.963946&tlat=52.2573&tlon=6.1799&v=motorcar&fast=1&layer=mapnik
getRout.php
<? require_once"RESTclient.class.php";
$url="http://www.yournavigation.org/api/1.0/gosmore.php?format=kml&flat=52.215676&flon=5.963946&tlat=52.2573&tlon=6.1799&v=motorcar&fast=1&layer=mapnik";
$result=RestClient::get($url,$inputs);
header("Content-type:text/xml");
echo($result->getResponse());?>
RESTclient.class.php
<?
/**
* Class RestClient
* Wraps HTTP calls using cURL, aimed for accessing and testing RESTful webservice.
* By Diogo Souza da Silva <manifesto#manifesto.blog.br>
*/
class RestClient {
private $curl ;
private $url ;
private $response ="";
private $headers = array();
private $method="GET";
private $params=null;
private $contentType = null;
private $file =null;
/**
* Private Constructor, sets default options
*/
private function __construct() {
$this->curl = curl_init();
curl_setopt($this->curl,CURLOPT_RETURNTRANSFER,true);
curl_setopt($this->curl,CURLOPT_AUTOREFERER,true); // This make sure will follow redirects
curl_setopt($this->curl,CURLOPT_FOLLOWLOCATION,true); // This too
curl_setopt($this->curl,CURLOPT_HEADER,true); // THis verbose option for extracting the headers
}
/**
* Execute the call to the webservice
* #return RestClient
*/
public function execute() {
if($this->method === "POST") {
curl_setopt($this->curl,CURLOPT_POST,true);
curl_setopt($this->curl,CURLOPT_POSTFIELDS,$this->params);
} else if($this->method == "GET"){
curl_setopt($this->curl,CURLOPT_HTTPGET,true);
$this->treatURL();
} else if($this->method === "PUT") {
curl_setopt($this->curl,CURLOPT_PUT,true);
$this->treatURL();
$this->file = tmpFile();
fwrite($this->file,$this->params);
fseek($this->file,0);
curl_setopt($this->curl,CURLOPT_INFILE,$this->file);
curl_setopt($this->curl,CURLOPT_INFILESIZE,strlen($this->params));
} else {
curl_setopt($this->curl,CURLOPT_CUSTOMREQUEST,$this->method);
}
if($this->contentType != null) {
curl_setopt($this->curl,CURLOPT_HTTPHEADER,array("Content-Type: ".$this->contentType));
}
curl_setopt($this->curl,CURLOPT_URL,$this->url);
$r = curl_exec($this->curl);
$this->treatResponse($r); // Extract the headers and response
return $this ;
}
/**
* Treats URL
*/
private function treatURL(){
if(is_array($this->params) && count($this->params) >= 1) { // Transform parameters in key/value pars in URL
if(!strpos($this->url,'?'))
$this->url .= '?' ;
foreach($this->params as $k=>$v) {
$this->url .= "&".urlencode($k)."=".urlencode($v);
}
}
return $this->url;
}
/*
* Treats the Response for extracting the Headers and Response
*/
private function treatResponse($r) {
if($r == null or strlen($r) < 1) {
return;
}
$parts = explode("\n\r",$r); // HTTP packets define that Headers end in a blank line (\n\r) where starts the body
while(preg_match('#HTTP/1.[0-1] 100 Continue#',$parts[0]) or preg_match("#Moved#",$parts[0])) {
// Continue header must be bypass
for($i=1;$i<count($parts);$i++) {
$parts[$i - 1] = trim($parts[$i]);
}
unset($parts[count($parts) - 1]);
}
preg_match("#Content-Type: ([a-zA-Z0-9-]+/?[a-zA-Z0-9-]*)#",$parts[0],$reg);// This extract the content type
$this->headers['content-type'] = $reg[1];
preg_match("#HTTP/1.[0-1] ([0-9]{3}) ([a-zA-Z ]+)#",$parts[0],$reg); // This extracts the response header Code and Message
$this->headers['code'] = $reg[1];
$this->headers['message'] = $reg[2];
$this->response = "";
for($i=1;$i<count($parts);$i++) {//This make sure that exploded response get back togheter
if($i > 1) {
$this->response .= "\n\r";
}
$this->response .= $parts[$i];
}
}
/*
* #return array
*/
public function getHeaders() {
return $this->headers;
}
/*
* #return string
*/
public function getResponse() {
return $this->response ;
}
/*
* HTTP response code (404,401,200,etc)
* #return int
*/
public function getResponseCode() {
return (int) $this->headers['code'];
}
/*
* HTTP response message (Not Found, Continue, etc )
* #return string
*/
public function getResponseMessage() {
return $this->headers['message'];
}
/*
* Content-Type (text/plain, application/xml, etc)
* #return string
*/
public function getResponseContentType() {
return $this->headers['content-type'];
}
/**
* This sets that will not follow redirects
* #return RestClient
*/
public function setNoFollow() {
curl_setopt($this->curl,CURLOPT_AUTOREFERER,false);
curl_setopt($this->curl,CURLOPT_FOLLOWLOCATION,false);
return $this;
}
/**
* This closes the connection and release resources
* #return RestClient
*/
public function close() {
curl_close($this->curl);
$this->curl = null ;
if($this->file !=null) {
fclose($this->file);
}
return $this ;
}
/**
* Sets the URL to be Called
* #return RestClient
*/
public function setUrl($url) {
$this->url = $url;
return $this;
}
/**
* Set the Content-Type of the request to be send
* Format like "application/xml" or "text/plain" or other
* #param string $contentType
* #return RestClient
*/
public function setContentType($contentType) {
$this->contentType = $contentType;
return $this;
}
/**
* Set the Credentials for BASIC Authentication
* #param string $user
* #param string $pass
* #return RestClient
*/
public function setCredentials($user,$pass) {
if($user != null) {
curl_setopt($this->curl,CURLOPT_HTTPAUTH,CURLAUTH_BASIC);
curl_setopt($this->curl,CURLOPT_USERPWD,"{$user}:{$pass}");
}
return $this;
}
/**
* Set the Request HTTP Method
* For now, only accepts GET and POST
* #param string $method
* #return RestClient
*/
public function setMethod($method) {
$this->method=$method;
return $this;
}
/**
* Set Parameters to be send on the request
* It can be both a key/value par array (as in array("key"=>"value"))
* or a string containing the body of the request, like a XML, JSON or other
* Proper content-type should be set for the body if not a array
* #param mixed $params
* #return RestClient
*/
public function setParameters($params) {
$this->params=$params;
return $this;
}
/**
* Creates the RESTClient
* #param string $url=null [optional]
* #return RestClient
*/
public static function createClient($url=null) {
$client = new RestClient ;
if($url != null) {
$client->setUrl($url);
}
return $client;
}
/**
* Convenience method wrapping a commom POST call
* #param string $url
* #param mixed params
* #param string $user=null [optional]
* #param string $password=null [optional]
* #param string $contentType="multpary/form-data" [optional] commom post (multipart/form-data) as default
* #return RestClient
*/
public static function post($url,$params=null,$user=null,$pwd=null,$contentType="multipart/form-data") {
return self::call("POST",$url,$params,$user,$pwd,$contentType);
}
/**
* Convenience method wrapping a commom PUT call
* #param string $url
* #param string $body
* #param string $user=null [optional]
* #param string $password=null [optional]
* #param string $contentType=null [optional]
* #return RestClient
*/
public static function put($url,$body,$user=null,$pwd=null,$contentType=null) {
return self::call("PUT",$url,$body,$user,$pwd,$contentType);
}
/**
* Convenience method wrapping a commom GET call
* #param string $url
* #param array params
* #param string $user=null [optional]
* #param string $password=null [optional]
* #return RestClient
*/
public static function get($url,array $params=null,$user=null,$pwd=null) {
return self::call("GET",$url,$params,$user,$pwd);
}
/**
* Convenience method wrapping a commom delete call
* #param string $url
* #param array params
* #param string $user=null [optional]
* #param string $password=null [optional]
* #return RestClient
*/
public static function delete($url,array $params=null,$user=null,$pwd=null) {
return self::call("DELETE",$url,$params,$user,$pwd);
}
/**
* Convenience method wrapping a commom custom call
* #param string $method
* #param string $url
* #param string $body
* #param string $user=null [optional]
* #param string $password=null [optional]
* #param string $contentType=null [optional]
* #return RestClient
*/
public static function call($method,$url,$body,$user=null,$pwd=null,$contentType=null) {
return self::createClient($url)
->setParameters($body)
->setMethod($method)
->setCredentials($user,$pwd)
->setContentType($contentType)
->execute()
->close();
}
}
?>

Answer 1

There's no problem in the xml. the problem you see in your browser is due to the empty characters before the start of the xml tag.
If you do a var_dump you'll see something like:
string(5726) " <--- carriage return
<?xml version="1.0" encoding="UTF-8"?>
You should change the treatResponse() method on the class, I solved it like this:
private function treatResponse($r) {
....
for($i=1;$i<count($parts);$i++) {
if($i > 1) {
$this->response .= "\n\r";
}
$this->response .= trim($parts[$i]);
}
}
hope this helps
Note: that empty line comes from the HTTP protocol that says that there should be an empty line after the headers http://en.wikipedia.org/wiki/Hypertext_Transfer_Protocol#Request_message

Answer 2

There is a line break before the xml declaration in the output because RestClient::treatResponse($r) doesn't "treat" the response as it should ;-)
I'd rather set curl_setopt($this->curl,CURLOPT_HEADER, false) in the constructor and reduce treatResponse() to
private function treatResponse($r) {
$this->response = $r;
$this->headers['content-type'] = curl_getinfo($this->curl, CURLINFO_CONTENT_TYPE);
$this->headers['code'] = curl_getinfo($this->curl, CURLINFO_HTTP_CODE);
// ok, that's not exactly the same ....
$this->headers['message'] = curl_getinfo($this->curl, CURLINFO_HTTP_CODE);
}

Answer 3

Ran your code - only error I got was:
Notice: Undefined variable: inputs
Removing $inputs - no errors

Answer 4

This worked for me
<?php
require_once("RESTclient.class.php");
$url="http://www.yournavigation.org/api/1.0/gosmore.php?format=kml&flat=52.215676&flon=5.963946&tlat=52.2573&tlon=6.1799&v=motorcar&fast=1&layer=mapnik";
$result=RestClient::get($url); // removed $input as suggested by Dan J
header("Content-type:text/xml");
echo(trim($result->getResponse())); // added trim to remove blank line before
// xml declaration
?>